J - integral has noting to do with the integral line , so it can evade the complex stress - strain field near the crack tip , moreover , j - integral is a stress - strain field parameter with clear definition and close theory , so it is very popular to the field of mechanics J积分具有与积分线路无关这一特点，故可避开裂纹尖端处极其复杂的应力、应变场，并且j积分是一个定义明确、理论严密的应力、应变场参量，因而受到了断裂力学工作者的青睐。
Abstract : the numerical simulation of the rheological warm extrusion molding of the missile shell , a kind of aluminum alloy part , has been carried out , including the simulation of metal flow in the mold cave , velocity field , stress field , strain field , temperature field , and nodal force etc 文摘:对铝合金零件弹托在温挤条件下的流变成形过程进行了数值模拟，其中包括对金属在模具型腔中的流动情况、速度场、应力场、应变场、温度场、节点力等的数值模拟。
With the adoption of the rate - sensitive constitutive relationship , it is asymptotically investigated the propagating tip fields of antiplane mode iii crack under the condition of incompressibility , and the dynamics equations are obtained separately governing the stress and strain fields at the crack - tip 采用这种率敏感型本构关系，本文对不可压缩条件下反平面型扩展裂纹的尖端场进行了渐近分析，分别求得了其裂纹尖端应力和应变场的动力学控制方程。
During the temperature fields , the results indicate that the processing parameters such as the extrusion velocity , casting temperature , perform preheating temperature , die preheating temperature and so on are important for the temperature fields besides the dwell time . they are must be in concordance each other to the deforming zone is in the quasi - solid state , and the stable semi - solid extrusion is implemented . during the deforming fields , the hyperbolic sine thermo - rigid - viscoplastic fem model is selected according to the forming feature of the process , and the variations of the stress - strain fields are studied 在温度场的模拟中，模拟结果表明，保压时间是影响制件成形质量的关键因素之一，挤压速度、液态金属浇注温度、预制体预热温度和模具预热温度等工艺参数对温度场的影响也很大，需进行参数之间的协调，只有当变形区内部始终维持准固态时，才能实现稳定的液-固挤压成形过程；在变形场的模拟中，根据液态浸渗挤压的成形特征，选用了双曲正弦刚-粘塑性有限元计算模型，研究了变形过程中应力应变场的变化规律，研究了模角对变形和金属流动的影响及变形力的变化过程和其影响因素。
In different in terne die travel , the metal flow characterize in warm extrusion forming processes and the affection for the flow of metal stage which made by the difference between the blank bottom altitude and the axial direction limiting size in warm extrusion forming technique have been analysed we have gotten the equivalent strain field and the velocity field and other field variable that the blank in different in terne die travel and the die travel - load curve . . at the same time , we have analyzed the contributing factor for the oil pump stator forming process optimized and achieve thereasonable die parameter for the war m extrusion forming finally , the optimized technics parameters were used into pilot production , then the qualified oil pump stator forging were produced , the analog results were compared with those of pilot production 论文具体分析研究了不同成形工艺过程中金属流动的特点，并对不同凸模行程下温挤成形过程中的金属流动特点、坯料连皮厚度(底部高度)与温挤压成形工艺中的轴向界限尺寸的差值对金属变形阶段的影响进行了分析，获得了坯料在不同凸模行程下的等效应变场、速度场等场变量及凸模行程-载荷曲线，同时对油泵定子成形过程的影响因素等进行了分析，优化并获得了合理的温挤成形工艺及模具参数。最后，利用模拟优化获得的各项工艺参数进行生产实验，得到实际生产出的合格油泵定子件，并将模拟结果与生产实验结果进行比较。
Abstract : based on the result of visioplasticity test , the law of tube central upsetting was created , and the calculated method of displacement field and strain field were obtained . in this study , the four deformation modes were showed when ratio of height to thickness of tubular billet is greater than 3 . the four modes were related to the distribution of strainless - plane 文摘:根据管坯视塑性实验法的实验结果，分析了无芯轴支撑条件下，管坯中部镦锻的变形规律，阐述了变形区位移场、应变场的计算方法；通过对实验结果的分析，得出了当镦粗比3 ，管坯中部镦锻时，内壁呈现四种典型的变形模式；论述了分流面的分布与四种变形模式之间的转化关系。
Based on the generalized variational principle of the modificatory variables and substituent shearing strain field interpolation of the bending theory of the mindilin plate , this paper brings up the nine - node mixed plate bending element and adopts the sap2000 ? a large - scale finite element analysis programs . by the examples , we find the precision of the method is satisfying 在对转换层厚板进行局部有限元分析时，本文提出了基于mindlin中厚板弯曲理论的修正的二类变量广义变分原理和替代剪应变场插值方法的九节点厚薄板通用的板弯曲单元，并采用了sap2000有限元程序。
